【单选题】【消耗次数：1】
实验操作过程中，从生物安全柜里，把实验用物品拿出，必须进行下列哪些操作后，方可拿出生物安全柜？
①
喷洒有效浓度的消毒剂，作用有效时间后，方可拿出
②
喷洒有效浓度的消毒剂，立即拿出
③
不需要喷洒消毒剂，可直接拿出生物安全柜
④
以上操作都可以
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